Daredevil OVERSHADOWS a SHIELD show. I want the show to debut smaller Marvel characters, who could eventually cameo in Avengers 2. Matt Murdock the lawyer makes sense as a liaison to SHIELD on the show

I don't think I would be too terribly concerned with Daredevil overshadowing SHIELD. This show is going to be about how SHIELD deals with a world that is seeing a growing population of heroes and villains. If Daredevil is available to them, and it seems the character now is, then I could see him getting a focus episode or a several episode arc.